海带多糖对光老化皮肤基质金属蛋白酶活性影响的实验研究

目的: 探索海带多糖(laminaria polysaccharide,LP)对光老化皮肤基质金属蛋白酶活性的影响。 方法: SPF级昆明小鼠背部剃毛,随机分为对照组、模型组、海带多糖低剂量组(LP-L,1 mg·kg^-1)、海带多糖高剂量组(LP-H,5 mg·kg^-1)、 Vit E 组(100 mg·kg^-1),每日腹腔注射给药2次。除对照组外,每日紫外线照射1 h,每周照射5次,UVB累积照射剂量为21.60 J·cm^-2,UVA累积照射剂量为84.02 J·cm^-2。8周后,取背部暴露皮肤,行HE染色测量真皮层厚度,化学比色法检测皮肤羟脯氨酸(Hyp)含量,ELISA法检测血清基质金属蛋白酶-1(MMP-1)、金属蛋白酶组织抑制物(TIMP-1)的含量,Real-time PCR法分析皮肤MMP-1,TIMP-1 mRNA的相对含量。 结果: 与模型组比较,LP-H组可以显著增加真皮层厚度、皮肤Hyp含量及血清TIMP-1的水平,显著降低血清MMP-1水平及皮肤MMP-1 mRNA相对含量。 结论: 海带多糖可以通过调节基质金属蛋白酶活性来调节光老化皮肤胶原蛋白的代谢。

Effect of laminarin polysaccharide on activity of matrix metalloproteinase in photoaging skin

Objective: To study the effect of laminarin polysaccharide (LP) on the activity of matrix metalloproteinase of photoaging skins. Method: Kunming SPF mice were prepared with back hair shaved, and randomly divided into the control group, the model group, the LP low does group (LP-L, 1 mg·kg^-1), the LP high dose group (LP-H, 5 mg·kg^-1) and the Vit E (100 mg·kg^-1) group. They were abdominally injected with drugs twice on a daily basis. Except for the control group, all groups were exposed to ultraviolet rays for 1 hour every day, five times on a weekly basis, with accumulated exposure dose of UVB being 21.60 J·cm^-2, and accumulated exposure dose of UVA being 84.02 J·cm^-2. Eight weeks later, exposed back skins were collected to detect thickness of dermis by HE stain, content of hydroxyproline (Hyp) by chemical colorimetry, and serum MMP-1 and TIMP-1 content by ELISA. In addition, matrix metalloproteinase-1 (MMP-1) mRNA and relative content of tissue inhibitor of metalloproteinase-1(TIMP-1) mRNA was analyzed with Real-time PCR. Result: Compared with the model group, the LP-H group could significantly increase the thickness of dermis, skin Hyp content and serum TIMP-1 level, and decrease relative content of MMP-1 mRNA in skin and MMP-1 content in serum. Conclusion: LP can regulate the metabolism of collagen photoaging skins by adjusting the activity of matrix metalloproteinase.